A dentigerous cyst, also known as a follicular cyst, is an epithelial-lined developmental cyst formed by accumulation of fluid between the reduced enamel epithelium and the crown of an unerupted tooth.[2][3][4] It is formed when there is an alteration in the reduced enamel epithelium and encloses the crown of an unerupted tooth at the cemento-enamel junction. Fluid is accumulated between reduced enamel epithelium and the crown of an unerupted tooth.
Dentigerous cysts are the second[5] most prevalent type of odontogenic cysts after radicular cyst. Seventy percent of the cases occur in the mandible. Dentigerous cysts are usually painless. The patient usually comes with a concern of delayed tooth eruption or facial swelling. A dentigerous cyst can go unnoticed and may be discovered coincidentally[6][7][5] on a regular radiographic examination.